Video Controls

APIs for manipulating video controls. More...

Functions
int	video_set_ctrl (const struct device *dev, struct video_control *control)
	Set the value of a control.
int	video_get_ctrl (const struct device *dev, struct video_control *control)
	Get the current value of a control.
int	video_query_ctrl (struct video_ctrl_query *cq)
	Query information about a control.
void	video_print_ctrl (const struct video_ctrl_query *const cq)
	Print all the information of a control.
int64_t	video_get_csi_link_freq (const struct device *dev, uint8_t bpp, uint8_t lane_nb)
	Return the link-frequency advertised by a device.

Detailed Description

APIs for manipulating video controls.

Function Documentation

video_get_csi_link_freq()

int64_t video_get_csi_link_freq	(	const struct device *	dev,
		uint8_t	bpp,
		uint8_t	lane_nb )

#include <video.h>

Return the link-frequency advertised by a device.

Device exposing a CSI link should advertise at least one of the following two controls:

• VIDEO_CID_LINK_FREQ
• VIDEO_CID_PIXEL_RATE

At first the helper will try read the VIDEO_CID_LINK_FREQ and if not available will approximate the link-frequency from the VIDEO_CID_PIXEL_RATE value, taking into consideration the bits per pixel of the format and the number of lanes.

Parameters

dev	Video device to query.
bpp	Amount of bits per pixel of the pixel format produced by the device
lane_nb	Number of CSI-2 lanes used

video_get_ctrl()

int video_get_ctrl	(	const struct device *	dev,
		struct video_control *	control )

#include <video.h>

Get the current value of a control.

This retrieve the value of a video control, value type depends on control ID, and must be interpreted accordingly.

Parameters

dev	Pointer to the device structure.
control	Pointer to the video control struct.

Return values

0	on success.
-EINVAL	Parameters are invalid.
-ENOTSUP	Format is not supported.
-EIO	General input / output error.

video_print_ctrl()

void video_print_ctrl

(

const struct video_ctrl_query *const

cq

)

#include <video.h>

Print all the information of a control.

Print all the information of a control including its name, type, flag, range, menu (if any) and current value, i.e. by invoking the video_get_ctrl(), in a human readable format.

Parameters

cq	Pointer to the control query struct.

video_query_ctrl()

int video_query_ctrl

(

struct video_ctrl_query *

cq

)

#include <video.h>

Query information about a control.

Applications set the id field of the query structure, the function fills the rest of this structure. It is possible to enumerate base class controls (i.e., VIDEO_CID_BASE + x) by calling this function with successive id values starting from VIDEO_CID_BASE up to and exclusive VIDEO_CID_LASTP1. The function may return -ENOTSUP if a control in this range is not supported. Applications can also enumerate private controls by starting at VIDEO_CID_PRIVATE_BASE and incrementing the id until the driver returns -ENOTSUP. For other control classes, it's a bit more difficult. Hence, the best way to enumerate all kinds of device's supported controls is to iterate with VIDEO_CTRL_FLAG_NEXT_CTRL.

Parameters

cq	Pointer to the control query struct.

Return values

0	on success.
-EINVAL	Control id is invalid.
-ENOTSUP	Control id is not supported.

video_set_ctrl()

int video_set_ctrl	(	const struct device *	dev,
		struct video_control *	control )

#include <video.h>

Set the value of a control.

This set the value of a video control, value type depends on control ID, and must be interpreted accordingly.

Parameters

dev	Pointer to the device structure for the driver instance.
control	Pointer to the video control struct.

Return values

0	on success.
-EINVAL	Parameters are invalid.
-ENOTSUP	Format is not supported.
-EIO	General input / output error.